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7 Operating information (continued)
Installation & Operation Manual
Cascade
When multiple appliances are installed, they can be wired
together in a cascade sequence. A maximum of eight
appliances can be controlled from a single control. In
this application one appliance would be designated as
the Leader control and all others would be designated
as Member controls. The set point or firing rate can be
controlled by the 0 - 10V input as well.
Once the Leader appliance receives a call for heat from a
BMS, or external thermostat, the control will determine
what the set point will be. A fixed temperature set point can
be programmed into the control. See Copper-fin
2
Service
Manual to program the set point.
If the pool water temperature is less than the set point - the
off differential, then the control will initiate a call for heat
on the Cascade.
The appliance will fire and will then stage its firing rate to
maintain the set point. If the first appliance reaches 100%
of its firing rate, the Leader will calculate at what point the
second appliance could fire at its minimum firing rate. At
this point, the Leader will fire the second appliance on the
Cascade. For a new startup, this would be the first Member
appliance. The appliance will fire and will then stage its
firing rate to maintain the set point.
If the set point still cannot be met, the Leader will continue
firing more Members until either the heat demand is met or
all appliances on the Cascade are firing. As the heat demand
decreases, the last appliance on will stage down to its
minimum firing rate. Once the demand for that appliance is
0% it will shut down. As the heat demand decreases further,
the second to last appliance will stage down and shut off.
This will continue until the demand is satisfied and all
appliances are shut off.
Night Setback operation of the pool heater within the Cascade is
available. Programming of the Space Heating (SH) Night Setback
will be done through the Leader heater. Refer to the Copper-fin
2
Service Manual for information regarding Night Setback.
Ramp Delay operation of the pool heaters as described in the
Copper-fin
2
Service Manual is available when the pool heaters
are part of a Cascade system.
Night setback
The controller may be programmed to reduce the pool water
heating during a certain time each day. A start and stop time can
be programmed for each day of the week.
Sequence of the cascade
To equalize the run time of all appliances on the Cascade, the
firing sequence will automatically be changed at set intervals.
For the first 24 hours after initializing the Cascade, the sequence
will be changed every hour. After that the sequence will be
changed once every 24 hours.
DAY SWITCHING ON SEQUENCE
Start L-M1-M2-M3-M4-M5-M6-M7
+ 1 hour M1-M2-M3-M4-M5-M6-M7-L
+ 2 hour M2-M3-M4-M5-M6-M7-L-M1